Transcript What is a transformer?
What is a transformer?
The voltage of an alternating current can be changed using a device called a
A transformer contains two coils that are wound around a soft
The alternating current in the
produces an alternating magnetic field.
This alternating magnetic field induces an alternating current in the
primary coil secondary coil
How does a transformer change voltage
in the secondary (output) coil depends on the
number of turns
on the primary and secondary coils. A
has more turns on the secondary coil and so
has fewer turns on the secondary coil and so
Where are transformers used?
A television needs a very high voltage to operate. It contains a
, which increases the voltage of the electricity supplied to the television.
This outdoor transformer decreases the voltage of the electricity carried by the national grid. It is an example of a
How are transformers used to supply electricity?
How does electricity get to your home?